The & symbol in a C++ variable declaration means it’s a reference. It happens to be a reference to a pointer, which explains the semantics you’re seeing; the called function can change the pointer in the calling context, since it has a reference to it. So, to reiterate, the “operative symbol” here is not *&, that combination … Read more
You realize it is not part of the output right? It’s just additional information provided by the IDE’s console. The real program is just outputting hellow as expected. Saying that the Process finished with exit code 0 means that everything worked ok. If an exception occurs in your program or otherwise an exit is generated with non-zero argument, the IDE is … Read more
Simple Git 2.0+ solution: As of Git 2.0, the behavior has become simpler: You can configure git with push.default = current to make life easier: I added this so now I can just push a new branch upstream with -u will track remote branch of the same name. Now with this configuration, you will auto-guess the remote reference to … Read more
updated for 2021] (Regardless if you are on Mac, Linux, or Windows:) If you are confused about how to start the latest version of python, on most platforms it is the case that python3 leaves your python2 installation intact (due to the above compatibility reasons); thus you can start python3 with the python3 command. Historically… The naming convention is that generally, most … Read more
[:] is the array slice syntax for every element in the array. This answer here goes more in depth of the general uses: Explain Python’s slice notation
I am currently using Beautiful Soup to parse an HTML file and calling get_text(), but it seems like I’m being left with a lot of \xa0 Unicode representing spaces. Is there an efficient way to remove all of them in Python 2.7, and change them into spaces? I guess the more generalized question would be, is … Read more
You can use it like this: Also works for multi-line array declaration
Like @Khashaa and @Richard Scriven point out in comments, you have to set consistent column names for all the data frames you want to append. Hence, you need to explicitly declare the columns names for the second data frame, de, then use rbind(). You only set column names for the first data frame, df:
It’s the last selected DOM node index. Chrome assigns an index to each DOM node you select. So $0 will always point to the last node you selected, while $1 will point to the node you selected before that. Think of it like a stack of most recently selected nodes. As an example, consider the following Now you opened … Read more
I want to create an adjacency matrix for a graph. Since I read it is not safe to use arrays of the form matrix[x][y] because they don’t check for range, I decided to use the vector template class of the stl. All I need to store in the matrix are boolean values. So my question is, if … Read more